Air-vent



UNITED STATES PATENT OFFICE.

ALFRED ROESCII, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TC THE DAVIS dzROESCH TEMPERATURE CONTROLLING CO., A CORPORA- TION OF NEW JERSEY.

AI R-VENT.

SPECIFICATION forming part of Letters iPatent No. 689,229, datedDecember 17, 1901. Application filed January 23, 1899. Serial No.703,032. (No model.)

To all whom, it may concern:

Be it known that I, ALFRED Reason, a citizen of the United States ofAmerica, and a resident of Bridgeport, Fairfield county, Connecticut,have invented certain new and use- 'ful Improvements in Air-Vents; ofwhich the following is a specification.

My invention relates to a thermostat, and more particularly to athermostat for controlling the air-vents of heating devices comprised ina heating system.

I will now describe a device embodying my invention and will then pointout the novel features in the claim.

Figure 1 represents a central vertical section through an automaticair-vent of a heating device and a thermostat controlling the same, thelatter made in accordance with my invention. ing device. Fig. 3represents a top view, partly in horizontal sect-ion, of a thermostatembodying my invention. Fig. 4 is a detail top view of a part embodiedin the construction of the air-vent of Fig. 1.

Similar reference characters represent corresponding parts in all thefigures.

Reference character3 designates a radiator which is a part of asteam-heating system.

4 is a steam-inlet pipe, which may be provided with a suitable valve, asusual, and 5 is an exhaust-pipe, which may also be provided with avalve.

6 designates my automatic air-vent as a whole. As shown, it is attachedto the dis charge side of the radiator, near the top thereof. I haveshown it as directly connected; but it may, if desired, be connectedthrough the medium of a pipe and located in any po-' sition as may bedesired.

Referring now more particularly to Fig. 2, in which my automaticair-vent is shown in central section on an enlarged scale,reference'character 7 designates a base-piece, consisting of a castingprovided at the'rear with a hollow screw-threaded boss 8, by which it isconnected to the heating system, and at the top with aninternally-screw-threaded cylindrical portion 9, which receives aninclosing dome or casing 10, screw-threaded to register.

therewith, and below with an externally-screw- Fig. 2isaside elevationof a heatsion, such as brass.

' threaded cylindrical extension 11, to which is fitted a cap or cover12.

Reference character 13 designates a hollow tube, connected at one endwith the dischargeopening 26,'and its opposite end closed, and supportedin the casting 7. It is substantially inverted-U shaped and in the'bendor arch is provided with an opening 14, which aifords communicationbetween the interior of the said tube and the dome or casing 10, whichopening flares outwardly to form a valve-seat.

l5 designates a valve-rod having a pointed end forming a valve 16, whichis adapted to register with the seat and close the opening 14. threadedtogether for the purpose of initial adjustment, the lower orinternally-screwthreaded part 17 being reduced at its extreme end toform a shoulder 18.

19 designates a spider or valve-rod support, (shown separately in detailin Fig. 4,) which has a central opening, through which the reduced end18 of the valve-rod is adapted to pass and against which the shoulderbears.

2O designates a thermostat of peculiar con struction. It is shown moreclearly and in detail in Fig. 3, and, as will be seen, consistsof threedisks, each having a central opening and all secured together by a bandor ring of' metal 21. The two outer disks 22 22 are quite thin and arecomposed of some material having a high coefficieut ot' expan- The innerdisk 23 is comparativelythick and is either composed of some materialhaving a lower coefficient of expansion, such as steel, or is made ofsmaller diameter. The outer ring 21 is also composed of some suchmaterial as steel. Under conditions of rise of temperature, such aswould be caused by steam impinging upon the thermostatic device,theouter disks 22,being secured against lateral movement in all directions,would buckle, while the middle 9 disk, if smaller in diameter, would befree to expand laterally. The thermostat being confined on one side bythe cap-or cover 12 and on the other by the spider supporting theValve-rod the said rod would by the said buckling of the ouierthermostatic plates be forced upwardly and the valve 16 caused to closethe opening 14.

In the drawings the various parts are shown as they would be while airwas being discharged and before the steam had acted upon thethermostatto close the valve. The valvestem or rod 15 is provided with abell-float 24 in order that should liquid, such as the water ofcondensation, rise in the heating system it shall not be allowed toescape through the air-vent. Rise of water in the device would raise thebell-float and close the valve independently of the thermostat.

25 designates a diaphragm arranged to close the lower end of thethermostat-chamber and is held in place between the cap or cover 12 andthe cylindrical extension 11. This diaphragm is intended to close thevalve 16 independently of the thermostat or float when the pressure ofthe healing system falls below :lT-HIOSDheIiu pressure, thus preventingthe taking into the system of air through the air vent or discharge. Thecap 12 has suitiable orifices to allow the atmospheric air aclcess tothe under side of the diaphragm.

The discharge-opening 26 from the tube 13 is shown as internallyscrew-threaded. A pipe may be fitted Lheretoand maylead away anywhere asmay be desired.

By my arrangement it will be seen that air may at all times bedischarged through the air-vent from the heating system, but that thedischarge of steam or Water or the return of air upon the condensationof steam in the system after the supply has been out 01f is ab-'solutely prevented in and by a device which is extremely simple andreliable in operation, easy ofconstruction, and composed of partsunlikely of derangement.

I do not make any claim to the air-Vent herein described, as the sameforms the subject-matter of a copending application filed May 5, 1899,Serial No. 715,708.

What I claim is- A thermostat consisting of a plurality of disks havingdifierent coefficients of expansion, and a ring having alow coeificientof expansion for holding said disks together at their peripheries, saiddisks being arranged first a disk having a high coefiicient ofexpansion, next a disk having a low coefficient of expansion, and so onalternately.

Signed by me at New York, N. Y. this 21st day of December, 1898.

ALFRE D ROESOH.

Witnesses:

JAMEs (J. CHAPIN, FRED. l-I. DAVIS.

